I did my first play through on hardcore, I've been stuck at the same point 1/2 way through act 4 on Insane for nearly a week now. Insane, is well...Insane
It's not as hard COD4 on veteran, hardest game I've ever played by a mile
I beat it in Insane and have played through the campaign 3 times. It is a pretty good game too bad it sucks online though. Only thing that is replayable in it is Horde mode.
I agree. When you get stuck, It does get frustraiting, but unlike bioshock, does not make you want to not go back to it for ages. I am toying with insane, but my skills are not good enough yet. My next goal is to survive all 50 waves of horde.